This might seem obvious at first ("Fade away", right?), but according to both U2's official site and this site, the lyrics are "and so to find a way". I'm listening right now to both the WAIA version and the studio version and I hear "and so fade away!"

Bono has been known to change lyrics depending on what he remembers, what he feels like, and if he thinks the original lyrics can be improved on. He probably sings both versions of the lyrics and means both of them, if for slightly different reasons. The songs aren't static; they can grow and have lives of their own.

The first time I heard this song, I thought he was saying "I'm not sleeping, alone" where he says "I'm not sleeping, oh no"! But, no, I've never heard him sing "find away". "Fade away" seems to fit the song meaning better.